(19)

(11)

EP 2 577 055 A2

(12)

(88) Date of publication A3: 29.03.2012 (43) Date of publication: 10.04.2013 Bulletin 2013/15 (21) Application number: 11723238.9 (22) Date of filing: 31.05.2011

(51) International Patent Classification (IPC):  F03D 7/04(2006.01) (86) International application number: PCT/DK2011/050183 (87) International publication number: WO 2011/150931 (08.12.2011 Gazette 2011/49)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 02.06.2010 US 350581 P 02.06.2010 DK 201070236 (71) Applicant: Vestas Wind Systems A/S 8940 Randers (DK)	(72) Inventors: ABDALLAH, Imad DK-800 Århus N (DK) MIRANDA, Erik Carl Lehnskov DK-8940 Randers SV (DK) ZAIB, Ali DK-9000 Aalborg (DK) (74) Representative: Swabe, Benjamin  Vestas Wind Systems A/S IPR Department Hedeager 42 8200 Aarhus N 8200 Aarhus N (DK)